Portable speaker



FIG. 1 is a top perspective view of a portable speaker;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown are included for the purpose of illustrating portions of the portable speaker that form no part of the claim. The short dash-long dash lines are boundary lines which do not form part of the claimed design. 

CLAIM We claim the ornamental design for a portable speaker, as shown and described. 